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Domino Theory
president eisenhower
Involvement began with Eisenhower (Ike) in '55 & terminated with Ford in '75.
President Eisenhower sent US Military Advisers to South Vietnam in 1955.
I think Kennedy is the answer you are seeking. Eisenhower started the US involvement in Vietnam and Kennedy sent in more people to train pilots and such .
president eisenhower
US involvement in Vietnam (then French Indochina) began during WWII, in supporting the Viet Mihn against the Japanese occupiers. US involvement against Ho Chi Mihn dates back to the French Indochina War, during which time Dwight D. Eisenhower was president.
President Eisenhower sent military advisors and maybe some technicians to Vietnam to help the government there stay in power. That was the beginning of US involvement there.
The Eisenhower Doctrine is actually not a document. It is a speech by President Dwight David Eisenhower. It was a "Special Message to Congress about the situation in the middle east during Eisenhower's President time.
Eisenhower sent some American military adviser to Vietnam and so initiated US involvement there. Kennedy did more of the same, but the war did not really start for the US until Johnson took office.
President Eisenhower served from 1953 to 1961.
Richard Nixon was the Vice President under President Eisenhower.